In Sapporo, I met an Ainu gardener, Ota Hideki, The Ainu are Japan's oldest indigenous group, and even lower on our social ladder than the Koreans. (7.5.7)
Since World War Z focuses on a global perspective, the prejudice theme usually hones in on the kinds of hatred between ethnicities or entire countries. Here's a quick reminder that prejudice exists within countries in the form of such things like caste systems or mixed ancestry. If you want to know more about the Ainu people, NOVA's got your back.